No Disk error

Whenever I log in I keep getting errors stating "There is no disk in the drive. Please insert a disk into drive \Device\Harddisk1\DR1." I can cancel out of the error but it keeps coming up. First ArcUpdate.exe, then Arc.exe a couple of times, then ArcChat.exe all give this error. What gives? I've never run this game from a disk before. I accessed it online through a download. Is there a way to make it stop looking for a disk?

Comments

You have a Removable Disk like USB Disk Plug it in !
When not Work
Set the in Disk Manager (windows) the Right Drive letter to Device! " C: is system Disk do not change it " all other letters free changeable

You have Arc Installed on a Removeable Disk or some Games and Arc have the old Path easier way is Deinstall Arc and Reinstall it but Data go lost ...

I'm sorry, but I'm not sure I understand. I downloaded this game from the internet - there was never a disk of any kind involved. No removable disk, USB disk, nothing. C: is the OS drive. Everything has been working fine for years but only recently started doing this.